CVE-2022-35923

Inefficient Regular Expression Complexity in v8n

v8n is a javascript validation library. Versions of v8n prior to 1.5.1 were found to have an inefficient regular expression complexity in the `lowercase()` and `uppercase()` regex which could lead to a denial of service attack. In testing of the `lowercase()` function a payload of 'a' + 'a'.repeat(i) + 'A' with 32 leading characters took 29443 ms to execute. The same issue happens with uppercase(). Users are advised to upgrade. There are no known workarounds for this issue.

Affected

imbrn · v8n

CVSS v3.1 NVD

7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS

1.76% chance of exploitation in the next 30 days, 78th percentile

Published

2022-08-02

Updated

2025-04-22

Proof-of-concept exploits (1)

• https://huntr.dev/bounties/2d92f644-593b-43b4-bfd1-c8042ac60609/

Security advisories

• imbrn/v8n/commit/92393862156fad190c05ec3f6e2bc73308dcd2f9
• imbrn/v8n/security/advisories/GHSA-xrx9-gj26-5wx9
• https://huntr.dev/bounties/2d92f644-593b-43b4-bfd1-c8042ac60609
• advisories/GHSA-xrx9-gj26-5wx9

References

• CVE Record
• NVD entry